$\"\"$

Area of the rectangle is $\"\"$ .

Observe the figure:

Length of the rectangle is $\"\"$ and breath is $\"\"$ .

Find area of square.

$\"\"$ (Orginal equation)

$\"\"$ (Substitute $\"\"$ and $\"\"$ in the equation)

$\"\"$ (Multiply)

$\"\"$

Therefore, the area of the square is $\"\"$ .

$\"\"$

The area of the square is $\"\"$ .